It is a conductor device with impedance, which is used to block the passage of current. It usually plays the role of voltage division and shunt in the circuit. Resistance is an energy-consuming device, which can convert electric energy into heat energy.

It is a static charge storage medium, a container for storing charge, and is mainly used in power supply filtering, signal filtering, signal coupling, resonance, filtering, compensation, charging and discharging, energy storage, DC blocking and other circuits.